Re: Flapping links

Good question.

Timers help. Additionally, mix duplex modes, speed on one side, encap types
etc... Also, fun, although not related to your question is using incorrect
subnet mask, ip unumbered, etc... on one side. This can make the protocols
crazy. ;-)

You want to be careful using shut and no shut to test, since the router may
try and help you out too much by alerting the protocols and router
operations of your shut and no shut commands. This was frustrating to me
when I used to use this method. The best way to simulate link and protocol
failures is for it to be somewhat 'unexpected' to the router / protocols.

Lastly, if you can pull the cable, this is a good way to simulate failures
... pulling a cable is a 'common' real world test! ;-))

HTH,

Andrew Lee Lissitz

On Wed, Apr 29, 2009 at 10:14 AM, Divin Mathew John <divinjohn_at_gmail.com>wrote:

> how can i emulate flapping links. i use dynamips to simulate the laps.
> i want to see the IP dampening feature work. i can give shut no
> shut... and make it flap...can i do something else? maybe play around
> with Keep alives?
> Thanking You
>
> Yours Sincerely
>
> Divin Mathew John
> divinjohn_at_gmail.com
> divin_at_dide3d.com
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-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net